presentPopoverFromRect在iOS8 beta中不显示popover [英] presentPopoverFromRect not displaying popover in iOS8 beta

问题描述

我正在将iOS7.1 iPad应用程序迁移到iOS8。我刚刚下载了Xcode 6 Beta，并在模拟器上运行了该应用程序。我注意到的第一件事是在iOS7.1中运行良好的弹出窗口不再起作用了。我创建popover的方式是：

I am migrating an iOS7.1 iPad app to iOS8. I just downloaded Xcode 6 Beta, and ran the application on a simulator. First thing I notice is the popovers which worked fine in iOS7.1 don't work anymore. The way I an creating the popover is:

// the popover controller
UIPopoverController *popOverController;
// the content to be shown in the popover
DropdownViewController dropdownVC = [self.navigationController.storyboard instantiateViewControllerWithIdentifier:@"DropdownViewController"];
// initialize popover
popOverController = [[UIPopoverController alloc] initWithContentViewController:dropdownVC];
// set delegate
dropdownPopOverController.delegate = self;
// set content size
[popOverController setPopoverContentSize:CGSizeMake(SIZE_POPOVER_WIDTH, SIZE_POPOVER_HEIGHT)];
// set the frame
CGRect frame = button.frame; // determine frame 
// present popover
[popOverController presentPopoverFromRect:frame
                                   inView:self.view
                   permittedArrowDirections:UIPopoverArrowDirectionLeft
                                 animated:YES];

有没有人遇到过类似的问题？是否必须在iOS8中以其他方式显示popovers。感谢您的投入。

Has anyone faced a similar issue? Do popovers have to be displayed in another way in iOS8. Thanks for your inputs.

推荐答案

所以我想出了如何在iOS8中显示popover：

So I figured out how to show the popover in iOS8:

在iOS7.1中，我使用

In iOS7.1, I was controlling the size of the popover content using

// set content size
[popOverController setPopoverContentSize:CGSizeMake(SIZE_POPOVER_WIDTH, SIZE_POPOVER_HEIGHT)];

在iOS8中，我将此更改为设置弹出视图中嵌入的视图的内容大小setPreferredContentSize属性如下：

In iOS8, I changed this to setting the content size of the view embedded in the popover view using the setPreferredContentSize property as follows:

dropdownVC.preferredContentSize = CGSizeMake(SIZE_POPOVER_WIDTH, SIZE_POPOVER_HEIGHT);

进行此更改后，将显示具有正确计算高度的弹出窗口。

After making this change, the popover with the correct calculated height is being displayed.

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